[whatwg] Same origin - Blob and FileSystem URLs

Hello
Certain parts of spesc are covering how to work with resources 
identified by URL and same-origin issue (download attribute, canvas)
looking at same-origin algorithm
http://www.whatwg.org/specs/web-apps/current-work/multipage/origin-0.html#same-origin
I'm wondering about Blob URL and FileSystem API URL. Those are not 
conventional URL but they are named as "URL" and one can work with them 
the same as with regular URL. How does the same-origin policy apply to 
those URLs?

Bronislav Klucka